Earth's gravity is about 9.8 meters per second square, or the equivalent 9.8 Newton per kilogram - so you just multiply the mass with 9.8. Weight will be in Newton.
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On Earth, 1,500 kg of mass weighs 14,710 newtons.
65.1 kg is a measure of mass. The weight of an object with mass 65.1 kg will depend upon the force of gravity at the point where it is weighed. For example, on the moon it will weigh about a sixth as much as it would on earth, whereas on a neutron star it would weigh much much more.
The gram already is a unit of mass.
An object with a mass of 20 kg weighs about 196 Newtons (44 pounds) on earth.
5 kilograms of mass is equivalent to 5,000grams.On the earth, that much mass weighs 49 newtons, or roughly 11 pounds.